package ren.solid.library.utils;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.media.ExifInterface;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.IOException;
/**
* 与Bitmap有关的工具类
* Created by _SOLID
* Date:2016/4/5
* Time:19:50
*/
public class BitmapUtils {
/**
* 获取图片的旋转角度
*
* @param path 图片绝对路径
* @return 图片的旋转角度
*/
private int getBitmapDegree(String path) {
int degree = 0;
try {
// 从指定路径下读取图片，并获取其EXIF信息
ExifInterface exifInterface = new ExifInterface(path);
// 获取图片的旋转信息
int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
degree = 90;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
degree = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_270:
degree = 270;
break;
}
} catch (IOException e) {
e.printStackTrace();
}
return degree;
}
/**
* 将图片按照指定的角度进行旋转
*
* @param bitmap 需要旋转的图片
* @param degree 指定的旋转角度
* @return 旋转后的图片
*/
public static Bitmap rotateBitmapByDegree(Bitmap bitmap, int degree) {
// 根据旋转角度，生成旋转矩阵
Matrix matrix = new Matrix();
matrix.postRotate(degree);
// 将原始图片按照旋转矩阵进行旋转，并得到新的图片
Bitmap newBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
bitmap.recycle();
return newBitmap;
}
/**
* Decode and sample down a bitmap from resources to the requested width and height.
*
* @param res The resources object containing the image data
* @param resId The resource id of the image data
* @param reqWidth The requested width of the resulting bitmap
* @param reqHeight The requested height of the resulting bitmap
* @return A bitmap sampled down from the original with the same aspect ratio and dimensions
* that are equal to or greater than the requested width and height
*/
public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId, int reqWidth, int reqHeight) {
// BEGIN_INCLUDE (read_bitmap_dimensions)
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(res, resId, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// END_INCLUDE (read_bitmap_dimensions)
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeResource(res, resId, options);
}
/**
* Decode and sample down a bitmap from a file to the requested width and height.
*
* @param filename The full path of the file to decode
* @param reqWidth The requested width of the resulting bitmap
* @param reqHeight The requested height of the resulting bitmap
* @return A bitmap sampled down from the original with the same aspect ratio and dimensions
* that are equal to or greater than the requested width and height
*/
public static Bitmap decodeSampledBitmapFromFile(String filename, int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filename, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(filename, options);
}
/**
* Decode and sample down a bitmap from a file input stream to the requested width and height.
*
* @param fileDescriptor The file descriptor to read from
* @param reqWidth The requested width of the resulting bitmap
* @param reqHeight The requested height of the resulting bitmap
* @return A bitmap sampled down from the original with the same aspect ratio and dimensions
* that are equal to or greater than the requested width and height
*/
public static Bitmap decodeSampledBitmapFromDescriptor(FileDescriptor fileDescriptor, int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);
}
/**
* Calculate an inSampleSize for use in a {@link BitmapFactory.Options} object when decoding
* bitmaps using the decode* methods from {@link BitmapFactory}. This implementation calculates
* the closest inSampleSize that is a power of 2 and will result in the final decoded bitmap
* having a width and height equal to or larger than the requested width and height.
*
* @param options An options object with out* params already populated (run through a decode*
* method with inJustDecodeBounds==true
* @param reqWidth The requested width of the resulting bitmap
* @param reqHeight The requested height of the resulting bitmap
* @return The value to be used for inSampleSize
*/
public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
// BEGIN_INCLUDE (calculate_sample_size)
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) {
inSampleSize *= 2;
}
// This offers some additional logic in case the image has a strange
// aspect ratio. For example, a panorama may have a much larger
// width than height. In these cases the total pixels might still
// end up being too large to fit comfortably in memory, so we should
// be more aggressive with sample down the image (=larger inSampleSize).
long totalPixels = width * height / inSampleSize;
// Anything more than 2x the requested pixels we'll sample down further
final long totalReqPixelsCap = reqWidth * reqHeight * 2;
while (totalPixels > totalReqPixelsCap) {
inSampleSize *= 2;
totalPixels /= 2;
}
}
return inSampleSize;
// END_INCLUDE (calculate_sample_size)
}
/**
* convert Bitmap to byte array
*/
public static byte[] bitmapToByte(Bitmap b) {
ByteArrayOutputStream o = new ByteArrayOutputStream();
b.compress(Bitmap.CompressFormat.PNG, 100, o);
return o.toByteArray();
}
/**
* convert byte array to Bitmap
*/
public static Bitmap byteToBitmap(byte[] b) {
return (b == null || b.length == 0) ? null : BitmapFactory.decodeByteArray(b, 0, b.length);
}
/**
* convert Drawable to Bitmap
*/
public static Bitmap drawableToBitmap(Drawable drawable) {
return drawable == null ? null : ((BitmapDrawable) drawable).getBitmap();
}
/**
* convert Bitmap to Drawable
*/
public static Drawable bitmapToDrawable(Bitmap bitmap) {
return bitmap == null ? null : new BitmapDrawable(bitmap);
}
/**
* convert Bitmap to round corner
*
* @param bitmap
* @return
*/
public static Bitmap toRoundCorner(Bitmap bitmap) {
int height = bitmap.getHeight();
int width = bitmap.getHeight();
Bitmap output = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, width, height);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(0xff424242);
//paint.setColor(Color.TRANSPARENT);
canvas.drawCircle(width / 2, height / 2, width / 2, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
public static Bitmap createBitmapThumbnail(Bitmap bitMap, boolean needRecycle) {
int width = bitMap.getWidth();
int height = bitMap.getHeight();
// 设置想要的大小
int newWidth = 120;
int newHeight = 120;
// 计算缩放比例
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// 取得想要缩放的matrix参数
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
// 得到新的图片
Bitmap newBitMap = Bitmap.createBitmap(bitMap, 0, 0, width, height,
matrix, true);
if (needRecycle) bitMap.recycle();
return newBitMap;
}
public static boolean saveBitmap(Bitmap bitmap, File file) {
if (bitmap == null) return false;
FileOutputStream fos = null;
try {
fos = new FileOutputStream(file, false);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.flush();
return true;
} catch (Exception e) {
e.printStackTrace();
} finally {
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return false;
}
public static boolean saveBitmap(Bitmap bitmap, String absPath) {
return saveBitmap(bitmap, new File(absPath));
}
}